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6. the lac operon has three structural genes:

  • lacZ, lacX and lacA
  • lacC, lacB and lacA
  • lacZ, lacY and lacA
  • lacZ, lacY and lacX

7. what are characteristics of a genetic code?

  • It is a triplet code (a codon) It is regenerative code, so each amino acid (except methionine) have more than one code Stop codons indicate the end of a polypeptide chain.
  • It is a triplet code (a codon) It is degenerate code, so each amino acid (except methionine) have more than one code, Stop codons indicate the end of a polypeptide chain.
  • It is a triplet code (a codon) It is degenerate code, so each amino acid (except ethionine) have more than one code Stop codons indicate the end of a polypeptide chain.
  • It is a triplet code (a codon) It is regenerative code, so each amino acid (except ethionine) have more than one code Stop codons indicate the end of a polypeptide chain.

8. what is a gene?

  • a chromosome that codes for a blood group/ phenotype
  • a length of DNA that codes for a polypeptide/ an enzyme
  • a chromsome that codes for a polypeptide/ an enzyme
  • a length of DNA that codes for a blood group/ phenotype

9. what is a genetic code?

  • a sequence of nucleotide bases with instructions for the construction of a polypeptide or a protein
  • a sequence of nucleotide bases with instructions for the construction of DNA
  • a sequence genes with instructions for the construction of DNA
  • a sequence of chromosomes with instructions for the construction of DNA

10. mutations can be.....

  • beneficial or neutral
  • harmful
  • beneficial, neutral or harmful
  • harmful or beneficial

11. where does transcription occur?

  • in the cytoplasm
  • in the ribosomes
  • in the nucleus
  • in the mitochondria